IPM

“ Schools ”

“ Centers and Units ”

“ Research Groups ”

“ Useful Links ”

“ E-Services ”

“School of Astronomy”

Paper IPM / Astronomy / 14932

School of Astronomy

Title:

Self-gravity in Magnetized Neutrino-dominated Accretion Disks

Author(s):

1 .	Narjes. Shahamat
2 .	Shahram. Abbassi

Status:

Published

Journal:

ApJ

No.:

Vol.:

845

Year:

2017

Supported by:

ipm IPM

Abstract:

In the present work we study self-gravity effects on the vertical structure of a magnetized neutrino-dominated accretion disk as a central engine for gamma-ray bursts (GRBs). Some of the disk physical timescales that are supposed to play a pivotal role in the late-time evolutions of the disk, such as viscous, cooling, and diffusion timescales, have been studied. We are interested in investigating the possibility of the occurrence of X-ray flares, observed in late-time GRBs' extended emission through the "magnetic barrier" and "fragmentation" processes in our model. The results lead us to interpret self-gravity as an amplifier for BlandfordâPayne luminosity (BP power) and the generated magnetic field, but a suppressor for neutrino luminosity and magnetic barrier processes via highlighting the fragmentation mechanism in the outer disk, especially for the higher mass accretion rates.

Download TeX format